Sellers of vitamin supplements are fond of saying that everybody is deficient in Vitamin D, and this means you. It seems like that would be an easy question to answer: just get a blood test and see whether your levels are low. Turns out it’s not that simple.»7/24/15 3:30pm 7/24/15 3:30pm

Dear Lifehacker, It's spring where I live, so I'm thinking about spring break, summer vacations, and visiting friends and family around the country. The trouble is, the TSA gives me the creeps. I understand they're just doing their jobs, but their screening tactics, the long lines, and the invasive searches… »4/09/12 10:00am 4/09/12 10:00am